That's the way the zone was designed, it seems. The walls are not lined up north-south. I think I went heavy on the shadows too, which adds to the effect. The east-most wall definitely curves the way the map shows. I checked that, as positioning in that room is crucial to the raid's success.

As to the water earth fire ice words, I can remove them if necessary, but they are not POI's nor are they placed even close to where the portals spawn. There should be no assumption made between the words and the location of the portals.